Update ADK Docs Path to adk.dev and rewrite instructions to be more explicit/clear to the model.

[holtskinner]

• Fix name of ADK
• Add .gitignore

[gemini-code-assist]

Code Review

This pull request updates the Agent Development Kit (ADK) documentation and configuration, including a new URL for the documentation source and improved instructions in GEMINI.md. Review feedback suggests explicitly naming the documentation source in the configuration for better model identification, ensuring consistency in example source names across files, and prioritizing the use of the built-in fetch_docs tool over external commands like curl for reliability.

[gemini-code-assist]

Naming the documentation source explicitly (e.g., ADK:https://adk.dev/llms.txt) is a best practice when using mcpdoc. This ensures that the source name matches the examples provided in the GEMINI.md instructions (e.g., "ADK"), making it easier for the model to identify and use the correct source.

Suggested change

	"https://adk.dev/llms.txt",
	"ADK:https://adk.dev/llms.txt",

[gemini-code-assist]

The example source name "Sample" does not match the example provided in the README.md (which uses Local_ADK_Docs on line 85). Updating this example ensures consistency across the documentation and helps the model understand the expected source naming patterns.

Suggested change

	1. **Discover**: Call `list_doc_sources` to identify available documentation sources (e.g., "ADK", "Sample").
	1. **Discover**: Call `list_doc_sources` to identify available documentation sources (e.g., "ADK", "Local_ADK_Docs").